How To Convert Teaspoon US to Milliliter
Formula: 1 Teaspoon US (tsp) = 4.92892159375 Milliliter (mL).
Example: Convert 2.5 Teaspoon US to Milliliter.
2.5 4.92892159375 = 12.322303984375 mL
To do it by hand, you only need one number, 4.92892159375.
Multiply your teaspoon value by 4.92892159375 to get milliliters.
If you need teaspoons from milliliters, divide by 4.92892159375.
Quick Answer
1 Teaspoon US = 4.92892159375 Milliliter
- 0.5 tsp = 2.464460796875 mL
- 2 tsp = 9.8578431875 mL
- 3 tsp = 14.78676478125 mL
Conversion Formula
mL = Teaspoon US 4.92892159375
Teaspoon US = mL 4.92892159375
This means every 1 US teaspoon is a little under 5 milliliters. The number 4.92892159375 is based on standard US volume definitions, where 1 US teaspoon is exactly 1/6 of a US fluid ounce, and 1 US fluid ounce is exactly 29.5735295625 mL.
- Write your amount in Teaspoon US.
- Multiply it by 4.92892159375.
- The result is the amount in milliliters (mL).
Teaspoon US
A US teaspoon is a small unit of volume used mostly in American cooking and measuring small liquid or powder amounts. Its common symbol is tsp.
It comes from traditional spoon based measures used in kitchens. Over time, it was standardized in the US customary system so recipes could be repeated with consistent results.
- Measuring spices, salt, baking powder, and yeast
- Small liquid amounts like vanilla extract, lemon juice, or vinegar
- Coffee and tea recipes, syrups, and sweeteners
- Simple home remedies and non prescription liquid doses (use the provided measuring tool)
- DIY mixing, like small amounts of food coloring or flavoring
Milliliter
A milliliter is a metric unit of volume equal to one thousandth of a liter. Its symbol is mL.
It grew in use with the metric system, which was designed for easy, base 10 measuring. Today, it is widely used in science, medicine, and most cooking outside the US.
- Measuring medicine and syrups (often shown in mL)
- Nutrition and beverage labels
- Cooking and baking with metric recipes
- Lab work, chemistry, and school experiments
- Cosmetics and skincare mixing
Is this Conversion of Teaspoon US To Milliliter Accurate?
Yes. This conversion is based on fixed, standardized unit definitions. A US teaspoon is defined as 1/6 of a US fluid ounce, and the US fluid ounce is defined as exactly 29.5735295625 milliliters. Using these exact values makes the result reliable for cooking, labeling, education, and general measurement.
For more details on how we choose and apply standards, read our methodology on accuracy standards.
Real Life Examples
Here are practical examples that show why tsp to mL conversion is useful in everyday life.
- Baking vanilla extract: A recipe asks for 2 tsp vanilla. That is 2 4.92892159375 = 9.8578431875 mL, helpful if you only have a metric jug.
- Making a spice rub: You want 0.5 tsp chili powder for a mild mix. That equals 2.464460796875 mL, useful when using a small metric spoon set.
- Simple syrup in coffee: Adding 1.5 tsp syrup is 1.5 4.92892159375 = 7.393382390625 mL, so you can measure with a syringe or mini beaker.
- Converting a metric recipe to US spoons: A sauce needs 10 mL of vinegar. In US teaspoons, 10 4.92892159375 = 2.028841362110459 tsp, which is about 2 tsp if you are rounding for cooking.
- Medicine dosing awareness: If a label says 5 mL, that is 5 4.92892159375 = 1.0144206810552296 tsp. For medicine, use a proper mL dosing syringe, not a kitchen spoon.
- Kitchen substitution: 1 tablespoon equals 3 US teaspoons, so it is 3 4.92892159375 = 14.78676478125 mL, helpful when you only have one type of measure.
- DIY flavor drops: If you mix 0.25 tsp of a flavoring into a drink, that is 1.2322303984375 mL, which is easy to measure with a small dropper marked in mL.
Quick Tips
- Use this anchor value: 1 tsp (US) = 4.92892159375 mL.
- For rough kitchen math, 1 tsp is close to 5 mL, but expect a small difference.
- Common spoon fractions convert fast: 1/2 tsp = 2.464460796875 mL, 1/4 tsp = 1.2322303984375 mL.
- Remember: 1 tbsp = 3 tsp = 14.78676478125 mL.
- For medicine, always measure in mL with a dosing tool, not a spoon.
- When scaling recipes, multiply teaspoons first, then convert to mL once to reduce rounding.